TY  - JOUR
AU  - Tomić, Miloš
AU  - Dunjić, Branko
AU  - Nikolić, Marija
AU  - Trifković, Kata T.
AU  - Stanković, Nadežda
AU  - Pavlović, Vladimir B.
AU  - Bajat, Jelena
AU  - Đonlagić, Jasna
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4262
AB  - In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites
EP  - 321
SP  - 311
VL  - 131
DO  - 10.1016/j.porgcoat.2019.02.037
ER  - 

@article{
author = "Tomić, Miloš and Dunjić, Branko and Nikolić, Marija and Trifković, Kata T. and Stanković, Nadežda and Pavlović, Vladimir B. and Bajat, Jelena and Đonlagić, Jasna",
year = "2019",
abstract = "In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites",
pages = "321-311",
volume = "131",
doi = "10.1016/j.porgcoat.2019.02.037"
}

Tomić, M., Dunjić, B., Nikolić, M., Trifković, K. T., Stanković, N., Pavlović, V. B., Bajat, J.,& Đonlagić, J.. (2019). Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 131, 311-321.
https://doi.org/10.1016/j.porgcoat.2019.02.037

Tomić M, Dunjić B, Nikolić M, Trifković KT, Stanković N, Pavlović VB, Bajat J, Đonlagić J. Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings. 2019;131:311-321.
doi:10.1016/j.porgcoat.2019.02.037 .

Tomić, Miloš, Dunjić, Branko, Nikolić, Marija, Trifković, Kata T., Stanković, Nadežda, Pavlović, Vladimir B., Bajat, Jelena, Đonlagić, Jasna, "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites" in Progress in Organic Coatings, 131 (2019):311-321,
https://doi.org/10.1016/j.porgcoat.2019.02.037 . .

TY  - JOUR
AU  - Nikolić, Marija
AU  - Petrović, Rada
AU  - Veljović, Đorđe
AU  - Ćosović, Vladan
AU  - Stanković, Nadežda
AU  - Đonlagić, Jasna
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3643
AB  - Poly(epsilon-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using ionic exchange. In order to reveal the influence of the organomodification on the nanoclay dispersion and the properties of the nano composites XRD, DSC, TG, SEM, TEM, optical microscopy, melt rheology and dynamic-mechanical analyses were performed. A better dispersion was achieved when organomodified sepiolites instead of native ones were used as fillers. As deduced from the melt rheology data, by analysis of the Cole-Cole plots, the best dispersion was obtained for SEP-SI nanoclay. The thermal stability was not improved, however in the initial stages of the thereto-oxidative degradation a delay in the weight loss was observed for nanocomposites with organomodified sepiolites. The mechanical properties of the nanocomposites were improved in comparison to PCL, particularly for those with modified sepiolites. In terms of mechanical properties the use of sepiolite modified with HDA gave the best results, as a consequence of better interaction between longer alkyl hydrophobic part of the organic modificator and the hydrophobic PCL matrix.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - European Polymer Journal
T1  - Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites
EP  - 209
SP  - 198
VL  - 97
DO  - 10.1016/j.eurpolymj.2017.10.010
ER  - 

@article{
author = "Nikolić, Marija and Petrović, Rada and Veljović, Đorđe and Ćosović, Vladan and Stanković, Nadežda and Đonlagić, Jasna",
year = "2017",
abstract = "Poly(epsilon-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using ionic exchange. In order to reveal the influence of the organomodification on the nanoclay dispersion and the properties of the nano composites XRD, DSC, TG, SEM, TEM, optical microscopy, melt rheology and dynamic-mechanical analyses were performed. A better dispersion was achieved when organomodified sepiolites instead of native ones were used as fillers. As deduced from the melt rheology data, by analysis of the Cole-Cole plots, the best dispersion was obtained for SEP-SI nanoclay. The thermal stability was not improved, however in the initial stages of the thereto-oxidative degradation a delay in the weight loss was observed for nanocomposites with organomodified sepiolites. The mechanical properties of the nanocomposites were improved in comparison to PCL, particularly for those with modified sepiolites. In terms of mechanical properties the use of sepiolite modified with HDA gave the best results, as a consequence of better interaction between longer alkyl hydrophobic part of the organic modificator and the hydrophobic PCL matrix.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "European Polymer Journal",
title = "Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites",
pages = "209-198",
volume = "97",
doi = "10.1016/j.eurpolymj.2017.10.010"
}

Nikolić, M., Petrović, R., Veljović, Đ., Ćosović, V., Stanković, N.,& Đonlagić, J.. (2017). Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites. in European Polymer Journal
Pergamon-Elsevier Science Ltd, Oxford., 97, 198-209.
https://doi.org/10.1016/j.eurpolymj.2017.10.010

Nikolić M, Petrović R, Veljović Đ, Ćosović V, Stanković N, Đonlagić J. Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites. in European Polymer Journal. 2017;97:198-209.
doi:10.1016/j.eurpolymj.2017.10.010 .

Nikolić, Marija, Petrović, Rada, Veljović, Đorđe, Ćosović, Vladan, Stanković, Nadežda, Đonlagić, Jasna, "Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites" in European Polymer Journal, 97 (2017):198-209,
https://doi.org/10.1016/j.eurpolymj.2017.10.010 . .

TY  - JOUR
AU  - Prekajski, Marija D.
AU  - Jokić, Bojan M.
AU  - Kalijadis, Ana
AU  - Maletaškić, Jelena
AU  - Stanković, Nadežda
AU  - Luković, Jelena M.
AU  - Matović, Branko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5842
AB  - Nanoemulsion technique, based on Ouzo effect, was applied for synthesis of the pure and silver doped (2.5 and 5 mol%) calcium hydroxyapatite (HAp). After calcination at 500 degrees C fully crystallized powders were obtained. X-ray powder diffraction analysis accompanied with Rietveld refinement revealed that the synthesized powders were single-phase hydroxyapatite. Raman spectroscopy also confirmed that the synthesized powders were single-phase. The obtained HAp particles were spherical in shape and their sizes were in the nanometer range which was revealed by field emission scanning electron microscopy analysis (FESEM). The successful synthesis of the single-phase Ag doped HAp showed that nanoemulsion method is a simple technique for obtaining pure and doped hydroxyapatite nanospheres.
T2  - Processing and Application of Ceramics
T1  - Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect
EP  - 174
IS  - 3
SP  - 169
VL  - 10
DO  - 10.2298/PAC1603169P
ER  - 

@article{
author = "Prekajski, Marija D. and Jokić, Bojan M. and Kalijadis, Ana and Maletaškić, Jelena and Stanković, Nadežda and Luković, Jelena M. and Matović, Branko",
year = "2016",
abstract = "Nanoemulsion technique, based on Ouzo effect, was applied for synthesis of the pure and silver doped (2.5 and 5 mol%) calcium hydroxyapatite (HAp). After calcination at 500 degrees C fully crystallized powders were obtained. X-ray powder diffraction analysis accompanied with Rietveld refinement revealed that the synthesized powders were single-phase hydroxyapatite. Raman spectroscopy also confirmed that the synthesized powders were single-phase. The obtained HAp particles were spherical in shape and their sizes were in the nanometer range which was revealed by field emission scanning electron microscopy analysis (FESEM). The successful synthesis of the single-phase Ag doped HAp showed that nanoemulsion method is a simple technique for obtaining pure and doped hydroxyapatite nanospheres.",
journal = "Processing and Application of Ceramics",
title = "Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect",
pages = "174-169",
number = "3",
volume = "10",
doi = "10.2298/PAC1603169P"
}

Prekajski, M. D., Jokić, B. M., Kalijadis, A., Maletaškić, J., Stanković, N., Luković, J. M.,& Matović, B.. (2016). Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect. in Processing and Application of Ceramics, 10(3), 169-174.
https://doi.org/10.2298/PAC1603169P

Prekajski MD, Jokić BM, Kalijadis A, Maletaškić J, Stanković N, Luković JM, Matović B. Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect. in Processing and Application of Ceramics. 2016;10(3):169-174.
doi:10.2298/PAC1603169P .

Prekajski, Marija D., Jokić, Bojan M., Kalijadis, Ana, Maletaškić, Jelena, Stanković, Nadežda, Luković, Jelena M., Matović, Branko, "Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect" in Processing and Application of Ceramics, 10, no. 3 (2016):169-174,
https://doi.org/10.2298/PAC1603169P . .

TY  - JOUR
AU  - Matović, Branko
AU  - Bučevac, Dušan
AU  - Urbanović, Vladimir
AU  - Stanković, Nadežda
AU  - Daneu, Nina
AU  - Volkov-Husović, Tatjana
AU  - Babić, Biljana M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3432
AB  - Additive-free beta-SiC nanopowders were densified by using high-pressure "anvil-type with hollows" apparatus at the pressure of 4 GPa in the range of 1500-1900 degrees C. The starting powder with average particle size of 10 nm was synthesized by a sol-gel process. Crystallite size and lattice parameters of the samples have been studied at room temperature by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the size of the crystallites gradually increases from 16 to 51 nm with increasing sintering temperature (1500 to 1900 degrees C). Fully densified sample ( gt 99%) was obtained at a sintering temperature of 1900 degrees C for 60 s. This sample exhibits nano-hardness and Young's modulus of elasticity of 35 GPa and 450 GPa, respectively. Modified vibratory cavitation test method was used for laboratory testing of the cavitation resistance. A very low erosion level with mass loss 0.1% after 10 h was exhibited during the cavitation test.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of the European Ceramic Society
T1  - Monolithic nanocrystalline SiC ceramics
EP  - 3010
IS  - 12
SP  - 3005
VL  - 36
DO  - 10.1016/j.jeurceramsoc.2015.10.031
ER  - 

@article{
author = "Matović, Branko and Bučevac, Dušan and Urbanović, Vladimir and Stanković, Nadežda and Daneu, Nina and Volkov-Husović, Tatjana and Babić, Biljana M.",
year = "2016",
abstract = "Additive-free beta-SiC nanopowders were densified by using high-pressure "anvil-type with hollows" apparatus at the pressure of 4 GPa in the range of 1500-1900 degrees C. The starting powder with average particle size of 10 nm was synthesized by a sol-gel process. Crystallite size and lattice parameters of the samples have been studied at room temperature by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the size of the crystallites gradually increases from 16 to 51 nm with increasing sintering temperature (1500 to 1900 degrees C). Fully densified sample ( gt 99%) was obtained at a sintering temperature of 1900 degrees C for 60 s. This sample exhibits nano-hardness and Young's modulus of elasticity of 35 GPa and 450 GPa, respectively. Modified vibratory cavitation test method was used for laboratory testing of the cavitation resistance. A very low erosion level with mass loss 0.1% after 10 h was exhibited during the cavitation test.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of the European Ceramic Society",
title = "Monolithic nanocrystalline SiC ceramics",
pages = "3010-3005",
number = "12",
volume = "36",
doi = "10.1016/j.jeurceramsoc.2015.10.031"
}

Matović, B., Bučevac, D., Urbanović, V., Stanković, N., Daneu, N., Volkov-Husović, T.,& Babić, B. M.. (2016). Monolithic nanocrystalline SiC ceramics. in Journal of the European Ceramic Society
Elsevier Sci Ltd, Oxford., 36(12), 3005-3010.
https://doi.org/10.1016/j.jeurceramsoc.2015.10.031

Matović B, Bučevac D, Urbanović V, Stanković N, Daneu N, Volkov-Husović T, Babić BM. Monolithic nanocrystalline SiC ceramics. in Journal of the European Ceramic Society. 2016;36(12):3005-3010.
doi:10.1016/j.jeurceramsoc.2015.10.031 .

Matović, Branko, Bučevac, Dušan, Urbanović, Vladimir, Stanković, Nadežda, Daneu, Nina, Volkov-Husović, Tatjana, Babić, Biljana M., "Monolithic nanocrystalline SiC ceramics" in Journal of the European Ceramic Society, 36, no. 12 (2016):3005-3010,
https://doi.org/10.1016/j.jeurceramsoc.2015.10.031 . .